Electrical warp stop motion



Oct. 30, 1928. 1,689,701 R. G. TURNER v ELECTRICAL WARP STOP MOTION Filed Jan. 6, 1928 Patented Oct. 3t i925 UNITED STATES PATENT OFFICE.

RICHARD G. TURNER, OF WORCESTER, Tvl'ASSAOI-IUSETTS, ASSIGNOR TO CROMPTON &

KNOWLES LOOM WORKS, 011 'WOROESTEE,

MAEJSAOI'IUSETTS.

MASSACHUSETTS, A CORPORATION OF ELECTRICAL WARP STOP MOTION.

Application filed January 6, 1928. Serial No. 244,976.

This invention relates to improvements in electrical warp stop motions and it is the general object of the invention to provide simplified means for retaining an indication after it'has been given by the stop motion.

In electrical warp stop motions it is customary toprovide a bank of drop wires so arranged that when one of them falls it will close an electric circuit the eli'ect of which is to energize an electro-magnet to set in motion a train of mechanism which will stop the loom. During the normal running of the loom the drop wires are found to vibrate considerably due to the jarring of the loom and there is no certainty that a drop wire once fallen will continue to have electric contact with the circuit and it is found that the drop wires vibrate su'liiciently to break the circuit from time to time even when the drop wire is supposed to be in down position. Furthermore, it is desirable to be able to stop a loom at any given point in the cycle of the pick and as the closing oi: the circuit due to the falling of the drop wire may occur at some point in the cycle of the loom other than the desired point and as vibration of the drop wire might break the circuit at the desired point so that stopping mechanism will be rendered lHGl'lQClLlVG, it is desirable to have some form of means to retain the initial. indication given by the warp stop motion. It is an important object of my present invention to accomplish this result by the use of a permanent magnet which shall operate to hold the armature of the electro-magnct in stopping position even though the electromagnet should be 'deenergized as a result oi the vibrating ot the drop wires.

It is necessary that the retaining device shall release the armature of the electromagnet so that the same may be restored to normal position when the loom is again set into operation and it is a further object oil my present invention so to dispose the perma nent magnet and that part of the mechanism controlled by the electro-magnet that the permanent magnet will be out of holdin position relatively to the armature of the electro-magnet when the loom is stopped, thereby releasing the aru'iature to assume normal position.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement ot' partshereinatiter described and set i orth in the claims.

In the accompanying drawings wherein I have shown a convenient ei'nbodii'i'ient of my invention, Fig. 1 is a vertical section of a loom having my invention applied thereto, the parts being shown in running position in full lines and in position preparatory to stopping in dotted lines,

Fig. 2 is a vertical section taken on line 22 of Fig. 1, and

Fig. 3 is a view similar to a portion of Fig. 1 but with the parts moved to stopping position and with the armature of the electromagnet moved out oi effective range of the permanent magnet, the electric circuit being indicated diagrammatically.

Referring to Fig. 1 l have shown a loom 10 having a warp beam 11 to supply a sheet of warp threads W which pass over a whip roll 12 toward the lease rods 13 and barnesses 1 1. The woven cloth C may extend over the breast beam 15 to be wound up by any convenient term of take-up mechanism not shown. The shipper handle 16 is secured to a shipper shaft 17 mounted for rotation in bearings 18 one of which is shown in the drawings, said bearings being held to the breast beam 15. lVhen the shipper handle is moved to the left as shown in Fig. 1 the power will be thrown on to drive the loom by mechanism not shown, but when the shipper handle moves to the right to assume the position shown in Fig. 3 power is thrown oil the loom and the latter comes to rest. It is not deemed necessary to give a detailed description oi? the shipping mechanism as this part oi? the loom is very well understood and it is sui'licient tor the purposes of my present invention to state that when shipper handle 16 is in the position shown in Fig. 1 the loom is operating normally and that when said shipper handle is moved to the position shown in Fig. 3 the loom will be stopped. The matter thus tar described is of common contruction and forms no part of my present invention.

I have shown herein one form of electrical warp stop motion and have shown a single said contact bar 22 is a metallic strip 23 insulated from the bar and so disposed as to engage inclined upper edge 2 of the slot 21. The drop wires are supported by the warp threads WV and under normal conditions there is no electrical connection between the bar and the strip 23. When a. drop wire falls, however, due to a fault in the corresponding warp thread, it will electrically connect the strip 23 and the bar 22,'at which time current will flow from the battery P over wire 25. to the bar 22, through the upper part of the drop wire to the strip 23, from said strip .23 through wire 26 to an clectro-magnet 27 which may be held in fined position with re spect to the loom by means of a bracket .28.. The. current will continue to. flow from the clectro-magnet back to batteryv P through wire .29. The effect of closing this circuit is to energizethemagnet 27 so that the same will attract a portion of the stopping mechanism of the loom about to be described. The mechanism just described in connection with the electro-n'iagnet is but one of several rtorms which may be employed and forms no particular part or my present invention, being a form which has gone into general use where electric, warp stop motions are employed.

My invention relates more particularly to the inechanisnr for retaining the indie "ion given by the fallen drop wire 'andyto means for releasing said indication after .he loom has been stopped. Accordingly, in carrying my invention into effect, I secure to the bottom shaft 30 in properly adjusted angular position by means oi a set screw 81 cam '32which cooperates with. a roll 33 mounted on the rear end of a lever A lined stud 35 affords pivotal support for the lever and the latter has a forwardly projc arm having alanife edge 3? which I'QcblVOS a periodic downward movement ire-m the position shown in Fig. 1. The right hand end of lever 34: is heavier "than the left hand end thereof so that the cam is always in driving relationship with the lover. I do not wish to be limited to the time which the knife edge 37 is moved downwardly nor to the frequency of its motion, as the loom may be an equal geared loom wherein the shaft 30 will rotate once for every picl: or it may be :a .so-called two to one loom wherein the bottom shaft rotates once every two picks of the loom.

'ilhe shipper shatt't has keyed thereto rearwardlyextending arm 40 to which i: pi tally connected as at ll the upper end oi. an armatu-re member 42 forward motion of r. rich is restrained and limited by a stop elf) secured to the loom frame. The armature member is provided with a projection a l normally located in close proximity to the electromagnet 4? when the shipper handle is runrung position or the pos ion iown in Fig. 1. Said armaturois also PlOVlClOCl with a pair of spaced projections 45 and 4:6, rcspccti vcly, which are normally placed opposite the poles N and S of a pern'iancnt magnet 4-? which as shown in Fig. 4 is held in lixed position by a. washer 48 and bolt 4.). The permanent magnet is held by the washer against a plate 50, said plate, magnet and washer all being held in position by the single bolt l9 which extends through a portion of the loom frame 10. If desired the plate 50 and washer may be of non-magnetic material so that the permanent magnet will have a maximum attractive force.

Under normal conditions the parts will be in the position shown in full lines in Fig. l, but as soon as a drop wire falls to energize electro-magnet 2? the latter will attract the projection 4 1- and move the armature member 42 from the full to the dotted line position shown in Fig. 1. This movement on the part of the member 42 will move nojertions 4.5 and 46 near the poles N and S, respectively, of the permanent magnet and the latter will be sullicicntly strong to hold said member 12 in thcdotted line position shown in Fig. '1 even though the elect-ro-magnet 27 should be come deenergized due to the breaking of the previously traced circuit at the drop wire as a result of vibration of the latter. At the predetermined point in the cycle ot the loom the cam 32 will or use depression of the knife r-dgc 37 to engage hook (30 of the armature and the latter will be moved downwardly from the position shown in dotted lines: in Fig. l to the position shown in Fig. 3, thus causing an oscillation of the shipper shaft l? to e'llcct stopping of the loom as previously set forth.

It will be seen from Fig. 3 that the poles N and S of the magnet are spaced a considerable distance from the projections 4-5 and 46, respectively, so as to be out of holding position with respect to said projections. The permanent magnet may be adjusted with respect to the projections 45 and do by loosening the bolt 49 and moving said in agnct either toward or from the armature member, this adjustment permitting a setting of the permanent magnet which will enable the same to retain the armature in the dotted line po* sition shown in Fig. 1 but rendering said magnet incapable of holding the armature member when the latter has moved to the position shown in F 3. It is a dillicult matter to stop the loom. instantly upon inovrmcni of the shipper handle so that as a matter of fact the lever 34; will receive a slight right hand movement around the stud '85 after the shipper handle assumes the position shown in Fig. 3 and this slight movement, due to the fact that the loom continues to run a fraction of a pick after the power is thrown off, will be sufiicientto disengage the knife edge 37 from the book on the bottom ot the armature member 42. The latter will there fore be free to move by its own weight against lill;

liar

the stop 43and as the shipper handle is pulled on to start the loom again after the warp fault has been corrected the projections 45 and 46 will move upwardly but at such a distance from the permanent magnet 47 as not to be attracted thereby.

From the foregoing it will be seen that I have provided a very simple means for retaining the indication of an electric warp stop motion so that the loom may be stopped at any predetermined point in the cycle of the pick. It will further be seen that the permanent magnet is so related to those portions of the armature member 42 which it is designed to attract that when the shipper handle moves to stopping position the per manent magnet is no longer operative to con trol the armature member 42 and the latter moves out of the field of influence of the permanent magnet.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not Wish to be limited to the details herein disclosed, but What I claim is:

1. In an electrical Warp stop motion for looms having a stopping member to be moved to stop the loom and an electro-magnetic device to be energized whenever a fault occurs in the warp, an armature member pivotally connected to the stopping member to be moved by the electro-magnet into stopping position, a permanent magnet to hold the armature member in stopping position, and

means to move the stopping member when the armature member is held in stopping position by the permanent magnet.

2. In an electrical warp stop motion for looms having a stopping member to be moved to stop the loom and an electromagnetic device to be energized whenever a fault occurs in the Warp, an armature member movable with respect to the stopping member and positioned to be moved by the electro-magnet to stopping position, a permanent magnet to hold the armature member when the latter has been moved to stopping position by the electro-magnet, and means to move said armature member to cause movement of the stopping member when said armature member is held by the permanent magnet.

3. In an electrical warp stop motion for looms having a stopping member to be moved to stop the loom and an electro-magnetic de-, vice to be energized Whenever a fault occurs in the Warp, an armature member, a permanent magnet, said armature member being normally out of range of attraction of the permanent magnet and being moved by the electro-magnet within the range of attraction of the permanent magnet to be held in stopping position by the latter, and means to move said armature member and stopping member when the armature member is held by the permanent magnet.

l. In an electrical warp stop motion for looms having a stopping member to be moved to stop the loom and an electro-magnetic device to be energized Whenever a fault occurs in the warp, a regularly moving element, an armature member connected to the stopping member and normally out of the path of the moving element, and a permanent magnet, said armature member normally being out of the attractive range of the permanent magnet but being moved into the attractive range by the electro-magnet, said pern'ianent magnet holding the armaturemember in the path of the regularly moving element to cause the latter to impart movement to the stopping membar.

5. In an electrical Warp stop motion for looms having a stopping member to be moved to stop the loom and an electro-magnetic device to be energized whenever a fault occurs in the warp, a regularly moving element, an armature member operatively connected to the stopping member, and a permanent magnet to hold the armature member in stopping position, said regularly moving member acting to move the armature member to move the stopping member and at the same time moving the armature member out of the range of influence of the permanent magnet.

6. In a warp stop motion for a loom having a stopping member to be moved to stop the loom, an electro-magnet, a permanent magnet, an armature member common to both magnets and normally out of the range of influence of the permanent magnet and operatively connected to the stopping member, means to energize the electro-magnet to attract the armature member when a fault oeours in the warp, said electro-magnet drawing the armature member into the field of influence of the permanent magnet and the latter holding said armature member, and means to act on said armature member to cause movement of the stopping member when the armature member is held by the permanent magnet.

7. In a warp stop motion for a loom having a stopping member to be moved to stop the loom, an electro-magnet, a permanent magnet, an armature member common to both magnets and normally out of the range of influence of the permanent magnet and operatively connected to the stopping member, means to energize the electro'magnet to at tract the armature member when a fault occurs in the warp, said electro-magnet drawing the armaturemember into the field of influence of the permanent magnet and the latter holding said armature member, and means to act on said armature member to cause movement of the stopping member when the armature member is held by the permanent magnet, said last named means to move the armaturemember outxot' the field of influence of the permanent member when moving he stopping member.

8. In .a Warp stop motion for a loom having a stopping member to be moved to stop the loom, an, electnomngnet to he energized whenever a fault occurs, in the warp, a permanent magnet, an armature member normally out of the field of influence of the permanent magnet but moved into the field of influence of the permanent magnet by the electro-magnet when the latter is energized, a regularly moving element operating at a given time in the cycle of the pick of the loom, said permanent magnet holding); the armature member in the path of the element so. that said armature member will be engaged by the regularly moving element independently of the attraction bet-ween theelectro-magnet and the armature member.

9- [n a warp stop motion fora loom having a stopping member to be moved to stop the loom, an electro-magnet, a pern'ianent magnet, .a regularly moving element, an armature member operatively connected to. the stopping member and normally out of the path of the element, means to cause said electromagnet to move the armature member into the path of the element Whenever a fault occurs. inthe Warp, said permanent magnet acting independently .oi the electro-im agnet to hold said armature member in thcpath of the element until the latter has ,a movement to engage said armatune member to cause movement of the stopping member.

1 0, In a warp Stopmotion for a loom having .a stopping member to be moved to stop the loom, an armature member operatively connected to the stopping membeit, two magnetic members each capable of holding the armature member, said armature. member normally being out of the range of influence of one of said magnets and being moved into the range of said magnetic member by the other magnetic member whenever a warp fault occurs, said other magnet tending to hold the armature mcljnbcr independently of the first magnetic incmber, and means to stop the loom at .a given point in the cycle of the pick of the loom when the armature mcmbcr is attracted by the second magnet.

.11. In a warp stop motion for a loom havinga stepping member (to be moved to shop the loom, an armature member operntivel) connected to, the stopping member, an electro-n'iagnct to be energized at warp fault to attract the aru'iatu-re mon'iber, a permanent magnet held in fixed position, said ariuahu'o norn'ially being out of the range of influence of said permanent magnet but being u'ioved into the range of influence oi? said permanent magnet by the electro-magnct, and means to act .on the armature member when the latter is attracted by the permanent magnet to move said stopping; member and also move said armature mcmher out of the field of influence of the permanent n'iagnet.

12. In a warp stop motion for a 100m hav ing a stopping member to be moved to stop the loom, an clectro-magnet to be energized at warp fault, a permanent magnet, a regularly moving element, an armature member operatimely connected to a stopping member and normally out of the field of influence ot the permanent magnet, said clectromag'net being operative to move the armature member into the field of influence of the pcruianent magnet at any point in the cycle of the pick of the loom when :a warp fault occurs, and said element being effective to move said armature member to stop, the loom and out of the range of influence of the permanent munnet at a predetermined point in the cycle of the pick of the loom.

In testimony whereof I have hereunto atfixed my signature.

RICHARD G. TURNER. 

